Staging: rt2870: rtusb_data.c: Checkpatch cleanup

drivers/staging/rt2870/common/rtusb_data.c:127: ERROR: return is not a function, parentheses are not required
drivers/staging/rt2870/common/rtusb_data.c:141: ERROR: return is not a function, parentheses are not required
drivers/staging/rt2870/common/rtusb_data.c:154: ERROR: space prohibited before that close parenthesis ')'
drivers/staging/rt2870/common/rtusb_data.c:204: ERROR: space prohibited after that '&' (ctx:VxW)

Signed-off-by: Andrea Gelmini <andrea.gelmini@gelma.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>